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// SPDX-License-Identifier: GPL-2.0
/*
* kernel/crash_dump.c - Memory preserving reboot related code.
*
* Created by: Simon Horman <horms@verge.net.au>
* Original code moved from kernel/crash.c
* Original code comment copied from the i386 version of this file
*/
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/crash_dump.h>
#include <linux/uio.h>
#include <asm/page.h>
ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
size_t csize, unsigned long offset)
{
void *vaddr;
if (!csize)
return 0;
vaddr = __va(pfn<<PAGE_SHIFT);
csize = copy_to_iter(vaddr + offset, csize, iter);
return csize;
}
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